Root for rotating wings



March 7, 1950 B. SZNYCER 2,499,696

ROOT FOR ROTATING WINGS Filed Dec. 10, 1948 3 Sheets-Sheet 1 INVENTDR yW 77% C4,

ATTORNEYS March 7, 1950 B. SZNYCER 2,499,696

ROOT FOR ROTATING WINGS Filed Dec. 10, 1948 3 Sheets-Sheet 2 INVE NTDRATTORNEYS March '1, 1950 sz c I 2,499,696

ROOT FOR ROTATING WINGS I I Filed Dec. 10, 1948 5 Sheets-Sheet 3INVENTDR ATTORNEYS Patented Mar. 7, 1950 2,499,696 ROOT FOR ROTATINGWINGS Bernard Sznycer, New York, N. Y., assignor to Intercity AirlineCompany, Montreal, Quebec,

Canada Application December 10, 1948, Serial No. 64,532 In CanadaFebruary 3, 1947 1 Claim. 1

The invention relates to improvements in a root for rotating wings, asdescribed in the present specification and illustrated in theaccompanying drawings that form a part of the same.

The invention consists essentially of the novel features of constructionas pointed out broadly and specifically in the claims for noveltyfollowing a description containing an explanation in detail of anacceptable form of the invention.

The objects of the invention are to provide a root for rotating wings onaircraft such as helicopters and the like; to devise a root which willsubstantially support a wing or blade on an air craft; to construct aroot for rotating wings which will facilitate the feathering of thesame; to provide a root for rotating wings in which the bearings for thesame will wear evenly thus minimizing the danger of brinelling; todevise a root for rotating wings which will be capable of resistingaxial and radial stress; to construct a root for rotating wings in whichthe various parts may be easily adjusted so as to prolong the life ofthe same; to devise a root for rotating wings which will be sturdy andyet light in weight; and generally to provide a root for rotating wingswhich will be durable,- dependable and efiicient, for its purpose.

In the drawings;

Figure 1 is a perspective view of an aircraft showing the rootattachment assembled thereon.

Figure 2 is a plan View showing the root attachment assembled betweenthe blade shank and the adaptor for the blade.

Figure 3 is a sectional view as taken on the line 33 in Figure 2.

Figure 4 is an enlarged side View partly in section showing the rootattachment as indicated in Figure 2.

Like numerals of reference indicate corresponding parts in the variousfigures.

Referring to the drawings, the root for rotating wings consists of thebearing housing as indicated by the numeral II). The adaptor II ishollow throughout the greater length of same and the inner end thereofis tapered outwardly to form a cup portion I2. The inner end of this cupI2 is internally threaded and engages with the externally threadedportion on the outer end of the bearin housing II].

In this manner the bearing housing II! in cooperation with the cupportion I2 of the adaptor iI enclose the bearings of the rootattachment. The free end of the adaptor II is fixedly secured to theroot end of the blade I3 and the tie rod I4 provided a reinforcing forthe same.

The spindle I5 is suitably connected to the blade yoke I6, which inturn, is suitably mounted on a driving means.

The spindle I 5 extends into the bearing housing I0 and the cup portionI2 of the adaptor II. The taper roller bearings I1 and I8 and the needlebearing I9 are suitably arranged so as to facilitate the oscillation ofthe bearing housing I0 and adaptor II on the spindle I5. The inner racesor cones 20 and 2i of the taper roller bearings I! and I8, respectively,are fitted on the spindle I5 in such a manner so as to permit a slightrotary movement of the same thereon. The clearances between the bore ofthe inner races 20 and 2I and the spindle I5 are greater than that ofstandard practice, but not sufiicient to cause faulty operation of thesame. The outer races or cups 22 and 23 are fixedl fitted in the bearinhousing I0 and the bearing rollers 24 and 25 are accommodated betweenthe same and the inner races 20 and 2| respectively. The outer races 22and 23 are held tightly against the spacer 26; while a clearance isprovided between the inner races 20 and 2i and the spacer H. The shell28 of the needle bearing I9 is a press fit in the bearing housing Illand the needles or rollers of the same ride on the spindle I5.

The spacer 29 is located between the inner race 20 of the bearing I! andthe needle bearing I9; while the spacer 30 holds the outer edge of theinner race 2| of the bearing I8 in position. The ring 3I is a press fiton the spindle I5 and rests against a shoulder on the same. The bearingsI1 and I8 are retained on the spindle I5 between the spacer 29 and thelock nut 32; while the bearing I9 is held in position on the same by thering 3| and the spacer 29. The bolt 33 provides a means of locking thelock nut 32 in posit on on the spindle I5 after the same has beensuitably adjusted.

The seal 34 is a press fit in the inner end of the bearing housing Iiiand forms a seal around the spindle I5. The cup portion I2 of theadaptor II is sealed off from the hollow portion of same by means of theplug 35. The seal 34 and plug 35 seal the bearings II, I8 and I9 withinthe closure formed by the bearing housing I0 and cup portion I2 of theadaptor II so that a lubricant may be contained therein. The plug 39 isfitted within the hollow portion of the spindle I5 thus preventing thelubricant from entering the same and escaping from the bearing housingIi] and adaptor The pin 36 looks the bearing housing I0 substantially inposition with respect to the adaptor I I after the same have beenthreaded together.

The control horn 31 is fixedly secured on the bearing housing In andadapted to be operated by the link 38, thus providing a means ofoscillating; the adaptor I l and blade 13.

In the operation of the invention the bearing [8, which is of the taperroller type, takes the thrust due "to centrifugal force, and incombination with the spacers 26 and 21 and the adaptor II, this bearinglocks the blade l3 axially. The

bearing l'l provides a locking support for the the bearings are loadedonly in one direction,

counteracts the danger of brinelling.

It will be seen from the foregoing that a root for rotating "Wings hasbeen provided that will minimize the brinelling of the bearings in same,

which normally would cause a serious vibratory problem.

What I claim is:

In a root for rotating wings, the combination of a spindle and a housingrotatable thereon, a pair of taperroller bearings and a needle bearingsupporting said housing on said spindle, said taper .roller bearingscomprising outer races and inner races, said outer races of said taperroller.

bearings being fixedly secured in said housing, said inner races of saidtaper roller bearings being movably supported on said-spindle and havinga clearance therebetween, thus permitting said inner races to changetheir position relative;

to said outer races during oscillation of the latter, taper rollersaccommodated between said outer .races and said inner races of saidtaper roller bearings, aspacer within said housing and located betweensaid outer races and substantially:

engaging the same, a second spacer fitted on said spindle and locatedbetween said inner races of said taper roller bearings, said secondspacer being smaller than the space between said inner races therebyproviding a clearance therebetween, said needle bearing comprising ashell and a plurality of needles rotatably supported therein, said shellbeing fixedly supportedin said-housing and said needles engagingaportion ofthe surface of said spindle, a third spacer located betweensaid needle bearing and said inner race of one of said taper rollerbearings and engaging the latter, a

fourth spacer engaging the outer edge of the other of-said inner racesof said taper roller bearings, -a locknut being threaded on said spindleand engaging's'aid fourth spacer, and said locknut being adjusted toexert suitable pressure through said fourth spacer, said taper rollerbearing adjacent said fourth spacer, said spacer betweensa-id taperroller bearings, the other of said roller bearings to said third spacerlocated between said last mentioned taper roller bearing and said needlebearing, thereby providing a meansuof holding said taper roller bearingassemblies substantially in position for operation and yet permittingsaid inner races of the same flexibility of movement so that said taperrollers will evenly wear the saidinner races as they travel theirrestricted distances during oscillation of said outer races and saidhousing.

BERNARD SZNYCER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,030,953 Gemeny Feb. 18, 19362,118,760 Ernst May 24, 1938 2,380,583 Cierva July 31, 1945 2,410,459Platt s Nov. 5, 1946 2,428,200 Campbell Sept. 30, 1947 FOREIGN PATENTSNumber Country Date 351,339 Italy Aug. 9, 1937

